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A search for tt resonances using lepton-plus-jets events in proton-proton collisions at √s=8 TeV with the ATLAS detector

The, ATLAS collaboration
•
Aad, G.
•
Abbott, B.
altro
GIORDANI, Mario
2015
  • journal article

Periodico
JOURNAL OF HIGH ENERGY PHYSICS
Abstract
A search for new particles that decay into top quark pairs is reported. The search is performed with the ATLAS experiment at the LHC using an integrated luminosity of 20.3 fb−1 of proton-proton collision data collected at a centre-of-mass energy of s √ =8 s=8 TeV. The lepton-plus-jets final state is used, where the top pair decays to W + bW − b ̄ ̄ W+bW−b ̄ , with one W boson decaying leptonically and the other hadronically. The invariant mass spectrum of top quark pairs is examined for local excesses or deficits that are inconsistent with the Standard Model predictions. No evidence for a top quark pair resonance is found, and 95% confidence-level limits on the production rate are determined for massive states in benchmark models. The upper limits on the cross-section times branching ratio of a narrow Z′ boson decaying to top pairs range from 4.2 pb to 0.03 pb for resonance masses from 0.4 TeV to 3.0 TeV. A narrow leptophobic topcolour Z′ boson with mass below 1.8 TeV is excluded. Upper limits are set on the cross-section times branching ratio for a broad colour-octet resonance with Γ/m = 15% decaying to tt ̄ tt ̄ . These range from 4.8 pb to 0.03 pb for masses from 0.4 TeV to 3.0 TeV. A Kaluza-Klein excitation of the gluon in a Randall-Sundrum model is excluded for masses below 2.2 TeV.
DOI
10.1007/JHEP08(2015)148
WOS
WOS:000363532500006
Archivio
http://hdl.handle.net/11390/1095822
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84978024583
https://www.scopus.com/inward/record.uri?eid=2-s2.0-84978024583&partnerID=40&md5=c6642f65eea73192e77e8f68dfeb1e9e
Diritti
metadata only access
Scopus© citazioni
103
Data di acquisizione
Jun 7, 2022
Vedi dettagli
Web of Science© citazioni
124
Data di acquisizione
Mar 27, 2024
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